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Topic: 320x64 LC7891 with u8glib (Read 1 time) previous topic - next topic

olikraus

Hi

Thanks for all the good pictures so far. I think i was able to isolate the problem.
Please locate line 64 of file u8g_pb8h1f.c

replace
Code: [Select]
  register uint8_t mask, tmp;
with
Code: [Select]

  register uint8_t mask;
  register u8g_uint_t tmp;


This should solve the problem. I also made the change in the repository:
http://code.google.com/p/u8glib/source/browse/csrc/u8g_pb8h1f.c
Procedures of pb8h1f have been written for a buffer of max 256 bytes. But this is wrong for your display. So the tmp variable needs to be 16 bit in 16 bit modes.

Oliver


xboxtux

Thank you so much Oliver, the screen is now working perfectly!  :)

Here is my u8g_dev_lc7981_320x64.c if you would like to add the device to the library
Code: [Select]
/*

  u8g_dev_lc7981_320x64.c

  Note: Requires 16 bit mode
 
  Tested with Varitronix MGLS32064-03.pdf
 
  Universal 8bit Graphics Library
 
  Copyright (c) 2012, olikraus@gmail.com
  All rights reserved.

  Redistribution and use in source and binary forms, with or without modification,
  are permitted provided that the following conditions are met:

  * Redistributions of source code must retain the above copyright notice, this list
    of conditions and the following disclaimer.
   
  * Redistributions in binary form must reproduce the above copyright notice, this
    list of conditions and the following disclaimer in the documentation and/or other
    materials provided with the distribution.

  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
  CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
  INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
  CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
  ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
 
 
*/

#include "u8g.h"

#define WIDTH 320
#define HEIGHT 64
#define PAGE_HEIGHT 8


/*
  http://www.gaw.ru/pdf/lcd/lcm/Varitronix/graf/MGLS32064-03.pdf
*/

static const uint8_t u8g_dev_lc7981_320x64_init_seq[] PROGMEM = {
  U8G_ESC_CS(0),             /* disable chip */
  U8G_ESC_ADR(1),           /* instruction mode */
  U8G_ESC_RST(15),           /* do reset low pulse with (15*16)+2 milliseconds (=maximum delay)*/
  U8G_ESC_CS(1),             /* enable chip */
  U8G_ESC_DLY(50),         /* delay 50 ms */
 
 
  U8G_ESC_ADR(1),               /* instruction mode */
  0x000,                                /* mode register */
  U8G_ESC_ADR(0),               /* data mode */
  0x032,                                /* display on (bit 5), master mode on (bit 4), graphics mode on (bit 1)*/

  U8G_ESC_ADR(1),               /* instruction mode */
  0x001,                                /* character/bits per pixel pitch */
  U8G_ESC_ADR(0),               /* data mode */
  0x007,                                /* 8 bits per pixel */

  U8G_ESC_ADR(1),               /* instruction mode */
  0x002,                                /* number of chars/byte width of the screen */
  U8G_ESC_ADR(0),               /* data mode */
  WIDTH/8-1,                         /* 8 bits per pixel */

  U8G_ESC_ADR(1),               /* instruction mode */
  0x003,                                /* time division */
  U8G_ESC_ADR(0),               /* data mode */
  0x07f,                                /*  */

  U8G_ESC_ADR(1),               /* instruction mode */
  0x008,                                /* display start low */
  U8G_ESC_ADR(0),               /* data mode */
  0x000,                                /*  */

  U8G_ESC_ADR(1),               /* instruction mode */
  0x009,                                /* display start high */
  U8G_ESC_ADR(0),               /* data mode */
  0x000,                                /*  */
   
  U8G_ESC_DLY(10),               /* delay 10 ms */
 
  U8G_ESC_CS(0),             /* disable chip */
  U8G_ESC_END                /* end of sequence */
};

uint8_t u8g_dev_lc7981_320x64_fn(u8g_t *u8g, u8g_dev_t *dev, uint8_t msg, void *arg)
{
  switch(msg)
  {
    case U8G_DEV_MSG_INIT:
      u8g_InitCom(u8g, dev);
      u8g_WriteEscSeqP(u8g, dev, u8g_dev_lc7981_320x64_init_seq);
      break;
    case U8G_DEV_MSG_STOP:
      break;
    case U8G_DEV_MSG_PAGE_NEXT:
      {
        uint8_t y, i;
        uint16_t disp_ram_adr;
        uint8_t *ptr;
        u8g_pb_t *pb = (u8g_pb_t *)(dev->dev_mem);
       
        u8g_SetAddress(u8g, dev, 1);           /* cmd mode */
        u8g_SetChipSelect(u8g, dev, 1);
        y = pb->p.page_y0;
        ptr = pb->buf;
        disp_ram_adr = WIDTH/8;
        disp_ram_adr *= y;
        for( i = 0; i < 8; i ++ )
        {
          u8g_SetAddress(u8g, dev, 1);           /* cmd mode */
          u8g_WriteByte(u8g, dev, 0x00a );      /* display ram (cursor) address low byte */
          u8g_SetAddress(u8g, dev, 0);           /* data mode */
          u8g_WriteByte(u8g, dev, disp_ram_adr & 0x0ff ); 

          u8g_SetAddress(u8g, dev, 1);           /* cmd mode */
          u8g_WriteByte(u8g, dev, 0x00b );      /* display ram (cursor) address hight byte */
          u8g_SetAddress(u8g, dev, 0);           /* data mode */
          u8g_WriteByte(u8g, dev, disp_ram_adr >> 8 ); 
         
          u8g_SetAddress(u8g, dev, 1);           /* cmd mode */
          u8g_WriteByte(u8g, dev, 0x00c );      /* write data */
          u8g_SetAddress(u8g, dev, 0);           /* data mode */
          u8g_WriteSequence(u8g, dev, WIDTH/8, ptr);
          ptr += WIDTH/8;
          disp_ram_adr += WIDTH/8;
        }
        u8g_SetChipSelect(u8g, dev, 0);
      }
      break;
  }
  return u8g_dev_pb8h1f_base_fn(u8g, dev, msg, arg);
}

U8G_PB_DEV(u8g_dev_lc7981_320x64_8bit, WIDTH, HEIGHT, PAGE_HEIGHT, u8g_dev_lc7981_320x64_fn, U8G_COM_FAST_PARALLEL);



olikraus

Hi

I have added an issue for this task on the project page and I will add the new device as soon as possible.
Thanks!

Oliver

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